G. C. | h. & H. | 
Observations of Nebule and Clusters of Stars. 129 
The * 16 is not on the engraving in P.T., 1850. The stars 1 and 2 could not 
be made out even during the clearest intervals (Moonlight). 
1872, Mar. 31. * 13 from N. Pos. 275°-55 (4). 
S165 — O18 - 223-00 (3) 
*14 — *13 197-16 (2) 
*15 — *14 293-56 (4) 
20 == Oi 222-13 (2) 
28 = Oy 278-17 (3) 
Sky variable, measures generally difficult. Stars 1 and 3 not seen, 17 is most 
probably a new *. 
1872, Apr. 2. * 18 from N Pos. 53°-57 (1), Dist. 513"-22 (1). 
1872, Apr. 3. Nu, Dist. 262’-0 (8). * 18 from n Pos. 83°°5 (8). 
IB, Ape, 8 © Girsm =O IRos, lgZeeil @) 
*6 — *4 238°20 (4) 
Nton Dist. 258'°63 (4) Distance not quite satisfactory. 
Stars 1 and 3 not seen. 
1872, Apr. 12. The points of greatest interest are : 
Ist. The complete invisibility of stars 1 and 3 (P.T., 1850). 
2nd. The inner convolution of the spiral seems to start from f side of N, and 
turning s and p becomes inv in the 2nd convol. near * No. 12. The 
2nd convol. could not be traced with certainty up to N. but appeared to 
rise about 2 of the way from N to * 5, and proceeding in the direction 
of 2 it becomes smb and afterwards makes a very sudden turn towards 
p side, after which it suddenly becomes F, and passing partly over and 
partly p * 12, it then spreads out and becomes e F, but can still be well 
made out p and partly inv * 8, after which it gradually fades away imme- 
diately p * 5. A 3rd convolution appears to take its rise in * 9, just s of 
which it is so sv m b that it is very difficult to determine whether 10 is a * 
or only a very dense part of the neb. As this convol. passes on it becomes 
first fainter and then a good deal brighter, and as it gets into the region f N 
it turns inwards and meets the 2nd convol. in the B patch before mentioned. 
This part is joined too by the left hand spiral branch coming from the small 
Nucl (n). 
3rd. Although the earlier Birr-observers as also O. Struve [P. T. 1861, p. 742], 
all mention the haziness of N, it is now remarkably concentrated and stellar, 
it is however surrounded by much more B neby than nis. Tested by lamp- 
light or by allowing them to pass almost off the small mirror there does not 
seem to be any material difference between them as regards brightness. 
4th. The edge of the 2nd convol. is very nearly rectilinear ons side. There is 
certainly no B convol. emerging from small Nucl on p side. 
1872, Apr. 13. Noticed that n is very excentrically situated towards the sf side 
of its surrounding neby ; sf it the sky appeared quite dark almost up to the 
Nucl (n).—The two streams of neby are in contact at * 12, from which they 
seem to diverge, the outer one becoming v F and diffused as described last 
night. 
1872, Apr. 14. Well seen in spite of Moonlight. The “elbow” well clear of 
neby on outside. Stars 1 and 3 not seen. At 10 there is a patch of neby 
but there is almost certainly a S * in the centre of it. The new * 17 n of 
10 seen by glimpses. Sky very dark between n and “elbow.” n looked 
almost like a bivalve and seemed to be separated by a lane from the arm 
which connects it with the L spiral. A new * (doubtless No. 2) from n 
Pos. 112°-95 (too F to be measured from N). 
1872, May 2. * 2 from n Pos. 111°°69 
*2 — N 47°94 
certainly seen, but e F. 
1872, May 8. Sky very clear. Principal points of interest are: Ist. The 
extreme faintness of the connexion between N andn. 2nd. A filling in of 
eF neby p* 5. 38rd. The way in which the inner spiral seems to receive a 
fresh access of brilliancy near * 12. 4th. The extreme outer circle or branch 
s 
TRANS. ROY. DUB. SOC., N.S., VOL. Il. 
